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Finding the Fourth Proportional to 431,443.60, 647,165.40 and 221,491.60

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Solution

The fourth proportional to 431,443.60, 647,165.40 and 221,491.60 is: 332,237.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,443.60 : 647,165.40 = 221,491.60 : x
  2. Step 2: Convert to fraction form
    431,443.60/647,165.40 = 221,491.60/x
  3. Step 3: Cross multiply
    431,443.60x = 647,165.40 × 221,491.60
  4. Step 4: Simplify right side
    431,443.60x = 143,341,699,910.64
  5. Step 5: Solve for x
    x = 143,341,699,910.64/431,443.60
  6. Step 6: Final answer
    x = 332,237.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.